WIP: remove the old database abstraction layer

remove such classes:
- DbBase
- DbConn
- DbTextStream
- Db

while here:
- remove: TextStream, SLog, TexTextStream

winixd/core/app.h

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2010-2023, Tomasz Sowa
+ * Copyright (c) 2010-2024, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -46,7 +46,6 @@
 #include <fcgiapp.h>
 
 #include "sessionmanager.h"
-#include "db/db.h"
 #include "functions/functions.h"
 #include "templates/templates.h"
 #include "compress.h"
@@ -99,10 +98,6 @@ public:
 	// users sessions
 	SessionManager session_manager;
 
-	// database (DEPRACATED)
-	Db db;
-	DbConn db_conn;
-
 	// an unique id for each request
 	size_t request_id;
 
@@ -170,8 +165,7 @@ private:
 
 	bool AddSystemThreads();
 
-	bool TranslateFCGInames(char * sock, char * sock_user, char * sock_group);
-	bool InitFCGIChmodChownSocket(char * sock, char * sock_user, char * sock_group);
+	bool InitFCGIChmodChownSocket(const char * sock);
 	bool DropPrivileges(char * user, char * group);
 	bool DropPrivileges(const char * user, uid_t uid, gid_t gid, bool additional_groups);
 	bool CheckAccessFromPlugins();